_________ (24)
A.mode
B.means
C.course
D.measure

_________ (25)
A.yet
B.despite
C.because
D.so

_________ (27)
A.estate
B.state
C.stage
D.position

_________ (28)
A.into
B.through
C.at
D.with

_________ (30)
A.discovery
B.revelation
C.detection
D.disclosure

What is the main topic of the passage?
A.A revolution in communication
B.The invention of optical fibers
C.New surgical techniques
D.The roles of optical fibers in medicine

His policies were beneficial to the economy as a whole.
A.harmless
B.crude
C.detrimental
D.innocent

A.certificate
B.available
C.appropriate
D.absolutely

A.monitor
B.depiction
C.desperate
D.fabulous

I am tired from staying up late last night studying. I am also worried about today’s test.
A.I am not only tired of staying up late last night studying but also worried about today’s test.
B.Tired from staying up late last night studying, today’s test also makes me worried.
C.Not only am I tired from staying up late last night studying but I am also worried about today’s test .
D.Because I am worried about today’s test, I stayed up late last night studying.